
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise使用</title>
</head>
<body>
    
    <script>
        
        const p = new Promise((resolve,reject)=>{
            // 异步执行代码
            setTimeout(() => {
                reject("失败")
                resolve("成功")
            }, 1000);
        })

        p.then(function (res) {
            console.log(res);
            
        }).catch(function (err) {
            console.log(err);
            
        })

    </script>
</body>
</html>